JQuery UI Draggable - 如何知道一个元素是可拖动的初始化？

Question

My logic is 我的逻辑是

if( !this.draginited() ) // a drag-disabled element shouldn't get pass here, as it is inited
  this.draggable({...})

I searched a lot and couldn't find a way to implement this logic, any ideas? 我搜索了很多，找不到实现这个逻辑的方法，任何想法？

Answer 1

Maybe there's an easier way, but the docs say: 也许有一种更简单的方法，但文档说：

Draggable elements gets a class of ui-draggable 可拖动元素获得一个ui-draggable类

so you could do something like: 所以你可以这样做：

if(!$("#foo").hasClass("ui-draggable")) {
    ...
}

so to wrap that up (untested): 所以包装它（未经测试）：

$.fn.isDraggable = function() {
    return $(this).hasClass("ui-draggable");
}

console.log($("#someElement").isDraggable());

Answer 2

The dragstart event is fired when dragging is started. 启动拖动时会触发dragstart事件。 More in the docs 更多的文档